var i=20;
var m = 5; 
let dme = {
   'dom1':function(){
    console.log("加法："+(i+m));
   },
   'dom2':function(){
    console.log("减法："+(i-m));
   },
   'dom3':function(){
    console.log("成法："+(i*m));
   },
   'dom4':function(){
    console.log("除法："+(i/m));
   },
   'dom5':function(){
    this.dom1();
    this.dom2();
    this.dom3();
    this.dom4();
   }
}
module.exports=dme;